Hi,
I've modeled a 3-d reinforced concrete frame and i'd like to perform a dynamic time-history analysis.
In particular i want to apply a second dynamic time-history analysis to my modeled structure already damaged or yielding due to the first dynamic time-history analysis.
In the Load Curves section i've defined time-hisory curves: accelerations for a story time of 20 seconds and so in the stages section i've edit the end of stage 20s, steps 2000 and time steps 0.01.
For the second curve i've chose a delay of 20 seconds and i put accelerations curve for a story time of 20 seconds; in the time-History Stages section i've defined the end of stage 40s (biginning 20 seconds), steps 2000 and time step 0.01.
In the Applied Loading section i've edited nodes, direction, Type, curve Multiplier, and curve name of dynamic time-history Load.
When i want to run the analysis a problem occurs: a window tells me "the end of the time-history stages should be within the loading curves range". I try to modify my imputs in Load Curves and stages section but the problem persist. I read help sistem of program and i follow already suggestions.
What should i do? Do you have any suggestions how to solve this problem?
Thanks
possibility of defining more time-history analysis
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seismosoft
- Posts: 1316
- Joined: 06 Jul 2007, 04:55
Re: possibility of defining more time-history analysis
Dear pam_282,
Not having examined your model, we may simply suggest that you combine the two accelerograms outside of the program (e.g. in Excel or similar), defining two [0.0] values in between (e.g. at t=20.01s and at t=40.00s).
The you load such single "unified" accelerogram into the program, and define three different stages, one from 0.01 to 20.00 seconds (with dt=0.01s), another from 20.01 to 40.00 seconds (with a larger dt of perhaps 1.0s) and a final one from 40.01 to 60.00 seconds (again with a dt=0.01s).
Hope the above helps.
Seismosoft Support
Not having examined your model, we may simply suggest that you combine the two accelerograms outside of the program (e.g. in Excel or similar), defining two [0.0] values in between (e.g. at t=20.01s and at t=40.00s).
The you load such single "unified" accelerogram into the program, and define three different stages, one from 0.01 to 20.00 seconds (with dt=0.01s), another from 20.01 to 40.00 seconds (with a larger dt of perhaps 1.0s) and a final one from 40.01 to 60.00 seconds (again with a dt=0.01s).
Hope the above helps.
Seismosoft Support